gold extraction chemical equation

Gold cyanidation - Wikipedia

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The Chemistry of Gold Extraction

Nov 17, 2010· Au & 2 NaCN + O2 + H2O --> NaAu(CN)2 + 3 NaOH. balances as. 4 Au + 8 NaCN + O2 + 2 H2O ---> 4 NaAu(CN)2 + 4 NaOH . question #117 at

Extracting Gold | HowStuffWorks

May 14, 2017· Powdered borax is white, consisting of soft colorless crystals that dissolve easily in water. Its chemical formula is Na 2 B 4 O 7 ·10H 2 O. Borax is also used in flux. It helps in gold smelting. Its melting point is 743 °C.

Extraction of Gold

Feb 23, 2009· ­Smelting, which results in nearly pure gold, involves melting the negative terminals in a furnace at about 2,100 degrees F (1,149 degrees C). When workers add a chemical mixture known as flux to the molten material, the gold separates from the metal used to make the terminals. Workers pour off the flux and then the gold.

Gold Recovery Chemicals | E-waste recycling beginners guide

Gold Chemical Extraction-processes. Plattner's Chlorination-process As a preliminary step the material is submitted to an oxidizing and chlorinating roasting, to convert metals other than gold into chlorides. ... In precipitating the gold by zinc, the proportion required is about seven times that indicated by the equation